As it stands, smartphones are the worst of both worlds though: the form factor of what is essentially a legacy communication device, but none of the human interfaces necessary to make it useful enough to really take advantage of all its computing power (and often also its software cripples the device unless you're running a custom android ROM). What people hate about smartphones isn't that they're constantly plugged in but that they have a device on them all the time that is basically designed to turn the user into the ideal consumer: a passive addict with no attention span. If it was more common to have access to portable hardware that is designed to empower users being creative and productive, maybe it'd be a different story.
But then again, I think most human beings probably want exactly what they're getting with smartphones and are miserable and alienated at the human condition itself of being so susceptible to seeking out low effort short term dopamine feedback loops.